D17 Series II Wiring

Burkie

Member
I was wondering if the Series II wiring is the same as the Series III? I just got this tractor (39843) so I haven't got into it too deep. The one concern I have is it's set up with negative ground. It also drains the battery overnight. It starts and runs fine and the battery appears to be charging when running. Lights don't work so I can't tell much from the ammeter. I found on here a diagram for a Series III thats why I'm asking. Thanks
 
If your tractor is negative ground, it"s been changed to who knows what? Relay or voltage regulator stuck, causing the battery drain? You need to ID the components you have, and test them.
 
Does it have a generator, or has it been changed to an alternator? Unless specially modified an alternator must be negative ground.

Generator came from factory positive ground, but if properly configured can run either polarity.

How do you determine that it is charging when running. If it is charging the ammeter should swing to + side. If it is running battery down overnight the ammeter should be showing - with engine not running.

My first suspect in the battery run down problem would be a stuck cut out relay in the regulator if it has a generator, or a shorted internal diode if it has an alternator.
 
It has a generator. The battery was completely dead so I jump started it and it stayed running once the jumpers were removed. Based on that I figured it must be charging. The ammeter is slightly + while running but I'll have to check it when not running. For now I'm unhooking the - terminal at night. I would like to rewire the tractor back to positive ground.
Thanks
 
If you just got the tractor what are the chances someone who forgot all about positive ground hooked it up negative ground? That could have stuck the regulator points.

Does the + or - on the coil go to distributor. With positive ground + goes to distributor, with negative ground - goes to distributor.

If battery was installed negative ground and ammeter leads not reversed your + indication could actually be a discharge.

To change back to positive ground, connect + on coil to side of distributor. Connect generator output and light and ignition supplies to one side of ammeter, other side of ammeter to hot battery connection on starter switch. Install battery with positive to ground frame. With lights or ignition on, points closed, the ammeter should read to - side. If not reverse connections.

Polarize generator before starting engine.

Points, condenser, and starter do not care whether positive or negative ground.
 

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